WISE OWL EXERCISES
- Simple Queries (4)
- Setting criteria using WHERE (5)
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- Calculations using dates (4)
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SQL | Setting criteria using WHERE exercise | Combine criteria to show possibly watery post-1970 events!
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- Go into SQL Server Management Studio;
- Open the SQL file you've just unzipped (you can press CTRL + O to do this); then
- Execute this script.
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First show a list of all events which might have something to do water. The Wise Owl interpretation of this is that one or more of the following is true:
- They take place in one of the island countries (8, 22, 30 and 35, corresponding to Japan, the Marshall Islands, Cuba and Sri Lanka respectively)
- Their EventDetails column contains the word Water (not the text Water, but the word)
- Their category is number 4 (Natural World)
This should return 11 rows. Now add a criterion to show only those events which happened since 1970 (you may need to use parentheses to get this to give the correct answer).
Here's what you should see as a result:
The final results from running this complicated query.
Save this as Somewhat contrived, then close it down.
I am not able to rin this, can anybody help.
select EventName, eventdetails, EventDate
where CountryID in (8,22,30,35)
or eventdetails like '%water%' or
CategoryID = 4
and eventdate > 1970-01-01
I am getting this error message:
Operand type clash: date is incompatible with int
cannot solve it
select EventName, EventDetails, EventDate from tblEvent where (CountryID = 8 or CountryID = 22 or CountryID = 30 or CountryID = 35) or EventDetails = '%water%' or CategoryID = 4 and year(EventDate) >= 1970
You need to put LIKE and not =:
EventDetails LIKE '%water%'
This will show rows where the event details match the pattern contained in the text string.
Correct answer is:
EventDetails like '% water %'
with spaces around. You are looking for the word water , not any text with water in it.
select * from tblEvent
where (CountryID in(8,22,30,35) or
EventDetails like '% water %' or
CategoryID = 4) and EventDate > '1970-01-01'
Combine criteria to show possibly watery post-1970 events!
Thee are only 4 events under the CategoryID 4. How come you have five in your solution?